EP2244844A2

EP2244844A2 - Drive device for high-pressure cleaning unit

Info

Publication number: EP2244844A2
Application number: EP08866868A
Authority: EP
Inventors: Wolfgang Müller; Thomas Maier; Reinhard Lorenz
Original assignee: Alfred Kaercher SE and Co KG
Current assignee: Alfred Kaercher SE and Co KG
Priority date: 2007-12-21
Filing date: 2008-12-17
Publication date: 2010-11-03
Also published as: CN102661383A; CN101861215A; EP2796212A1; DE102007063541A1; CN102661383B; WO2009083154A2; WO2009083154A3; CN101861215B

Abstract

The invention relates to a drive device for a high-pressure cleaning unit having a motor, the motor shaft of which is coupled via a planetary gear to a swash plate, wherein the planetary gear has a stationery solar gear connected to the motor shaft, which solar gear meshes with planetary wheels which are mounted so as to be able to rotate on a planetary bearing and engage with an internally toothed hollow wheel and with their end side facing away from the planetary bearing lie against a support element so as to able to slide. In order to construct the drive device in such a manner that it has an improved service life, it is proposed according to the invention that the support element takes up a wear-inhibiting bearing region for the planetary wheels. Alternatively, or supplementary thereto, it is proposed that the swash plate is supported by a bearing plate which dips into a receptacle which supports the bearing plate in an axial and radial direction.

Description

Drive device for high-pressure cleaning device

The invention relates to a drive device for a high-pressure cleaner, with a motor, the motor shaft is coupled via a planetary gear with a swash plate, the planetary gear having a non-rotatably connected to the motor shaft sun gear, which meshes with rotatably mounted on a planet carrier planetary gears with an internally toothed ring gear are engaged and with their planetary carrier facing away from the end face to a support member are slidably applied.

By means of such a drive device, the piston pump of a high-pressure cleaning device can be driven. The swash plate transmits the rotational movement of the motor shaft in a reciprocating motion of the piston of the piston pump. For this purpose, the pistons can rest against a pressure plate which is oriented obliquely to the motor shaft and bears against the swash plate via a swash plate bearing. The swash plate is coupled via a planetary gear with the motor shaft, it may, for example, be rotatably connected to the planet carrier on which a plurality, preferably three, planet gears are rotatably mounted. The planet gears are on the one hand with the rotatably connected to the motor shaft sun gear and on the other hand with the planetary gears surrounding internally toothed ring gear engaged.

The planet gears are often held axially displaceable on the planet carrier and lie during operation of the drive device with its planetary carrier facing away from the end face slidably on a support element. The support element may, for example, be provided by a housing part of the planetary gearbox. bes or be formed by a motor flange. The sliding contact of the planet gears on the support element due to the friction occurring to wear that affects the life of the drive device.

Object of the present invention is to develop a drive device of the type mentioned in such a way that it has an improved life.

This object is achieved in a drive device of the generic type according to the invention in that the support element has a wear-resistant abutment region for the planetary gears.

The idea flows into the invention that the service life of the drive device can be improved by providing a wear-resistant abutment region, to which the planetary gears are slidably mountable. As a result, the wear of the planet gears can be reduced and friction losses can be reduced.

The wear-resistant contact area can extend over the entire surface of the support element. However, it can also be provided that, for example, only the end face of the support element facing the planet wheels forms the wear-resistant contact area.

The wear-resistant abutment region of the support element forms a stop which limits the axial movement of the planetary gears relative to the planet carrier in the direction facing the engine. An axial fixation of the planet gears on the planet carrier can be omitted.

The support element is preferably arranged on a motor flange of the engine. The motor flange serves for the rotatable mounting of the motor shaft and is arranged on the side facing away from the swash plate of the planetary gear.

Preferably, the support element dips into a recess of the motor flange.

It is advantageous if the support element is positively connected to the motor flange. The support member may for example be pressed or inserted in a recess of the motor flange. It can also be provided that the support element by means of connecting elements, such as connecting screws or connecting pins, is connected to the motor flange.

The provision of a support element with a wear-inhibiting abutment region for the planet gears is particularly advantageous if the planet gears are made of a plastic material, for example of a POM (polyoxymethylene) material, which preferably has no fiber reinforcement.

The support member is formed in an advantageous embodiment of the invention as arranged concentrically to the motor shaft support ring.

Preferably, the support element is made of a plastic material, for example of a POM (polyoxymethylene) material, which has no fiber reinforcement in an advantageous embodiment. The non-fiber reinforced POM material has only a very low friction with respect to the slidingly abutting planet gears, so that the planetary wheels facing end face of the support element forms a wear and friction-reducing abutment area.

Alternatively, it can be provided that the support element comprises a wear and friction-reducing coating, against which the planetary gears abut the end face.

According to a further alternative it can be provided that the support element is designed as a multi-component injection molded part, in particular as a two-component injection molded part, wherein the Pianetenrädern facing component forms the wear and friction-reducing contact area.

It is particularly advantageous if the support element and the planet wheels are made of the same plastic material which has no fiber reinforcement. It has been shown that thereby the wear of the planetary gears can be kept very low.

Preferably, the planetary gear comprises a housing which is frontally covered by a motor flange holding the support element. The housing and the motor flange form a cup-shaped assembly, at the bottom of the support element is arranged. Preferably, the housing is cohesively or integrally connected to the motor flange. The housing may for example be glued or welded to the motor flange.

It is particularly advantageous if the housing and the motor flange form a one-piece plastic molded part. Conveniently, the plastic molding is made of a fiber-reinforced plastic material, because the mechanical strength of the plastic molding can be increased.

As mentioned above, the drive device has a swash plate. This is supported in the axial direction via a support bearing of a bearing plate. In many cases, the axial location of the bearing plate is characterized in that it sits on the front side of the teeth of the ring gear. However, it has been found that the life of the drive device can be improved and its assembly costs can be reduced if the bearing plate dips into a receptacle which supports the bearing plate in the axial and radial directions. In the recording, the bearing plate is held reliably and the mechanical stress on the teeth of the ring gear can be reduced. Thereby, the life of the drive device can be improved.

Preferably, the recording takes the bearing plate accurately. For example, the bearing plate may be inserted via a clearance fit or a press fit into the receptacle.

Preferably, the bearing plate can be pressed or inserted into the receptacle. In order to simplify the assembly of the drive device further, it is advantageous if the receptacle has an expanding in the axial direction of the insertion section for inserting the bearing plate and a cylindrical holding portion for holding the bearing plate. The insertion section may for example be designed as a conical extension or curved in an arc. The insertion section forms an assembly aid, which facilitates the insertion of the bearing plate in the holding portion of the receptacle.

The receptacle is designed in an advantageous embodiment of the invention as a support ring which is insertable in a housing surrounding the planetary gear and / or the swash plate. The receptacle thus forms an independent component that receives the bearing plate.

The support ring may rest against a shoulder of a housing surrounding the planetary gear and / or the swash plate. The housing may for example have a first, facing the engine cylindrical housing portion which widens over the shoulder in the radial direction and merges into a second cylindrical housing portion which faces away from the engine. In the area of the shoulder, the support ring can be positioned.

Alternatively it can be provided that the receptacle is formed in a housing surrounding the planetary gear and / or the swash plate. The receptacle forms in such a configuration together with the housing a one-piece component. As a result, the assembly and manufac- turing costs can be additionally reduced. It is advantageous if at least one channel is arranged in the receptacle which receives the bearing plate, which interconnects the regions of the drive device arranged on both sides of the bearing plate. The channel may for example be molded into the receptacle. It makes it possible to balance the oil between the region of the drive device arranged in the axial direction in front of the bearing plate and the region arranged behind the bearing plate in the axial direction. The front area in particular receives the swash plate. Oil, which is arranged in the region of the swash plate, can pass through the channel in a rear region having the planetary gear. Thus, sufficient lubrication of the planetary gear is ensured via the channel.

It is advantageous if at least two diametrically opposite channels are formed in the receptacle, because this allows a particularly flow-favorable oil balance within the drive device.

As already explained, the bearing plate is supported by the receptacle in the axial and in the radial direction. For axial support, the receptacle has a bottom. This is preferably arranged in the axial direction in front of the end faces of the teeth of the ring gear facing the dewing disk, so that the teeth are not impaired by the bearing plate. Alternatively it can be provided that the bottom of the receptacle is arranged axially at the same height as the front edges of the teeth. Also, the teeth are relieved, since the bearing plate is supported in such an embodiment not only on the front edges of the teeth but also on the bottom of the recording. Preferably, the drive device comprises a planetary gear and / or the swash plate receiving housing and at least one motor shaft overlying motor flange, wherein the housing and a motor flange are connected materially or integrally with each other. The housing may be glued or welded to the motor flange, for example. It is particularly advantageous if the housing and the motor flange form a one-piece plastic molded part. The latter can for example be made of a fiber-reinforced plastic material.

The following description of two preferred embodiments of the invention is used in conjunction with the drawings for further explanation. Show it:

FIG. 1 shows a schematic sectional view of a first embodiment of a drive device according to the invention;

FIG. 2 shows an enlarged sectional view of detail X from FIG. 1;

Figure 3 is a schematic sectional view of a second embodiment of a drive device according to the invention and

FIG. 4 shows an enlarged sectional view of detail Y from FIG. 3.

FIGS. 1 and 2 show diagrammatically a first embodiment of a drive device according to the invention, which is generally designated by the reference numeral 10. By means of the drive device 10, the piston pump of a high-pressure cleaning device can be driven. it includes For this purpose, an electric motor 12 with a rotatably mounted on a motor flange 13 motor shaft 14 which is rotatably coupled via a planetary gear 16 with a swash plate 18, at the interposition of a swash plate bearing 20 a flat, to the longitudinal axis 24 of the motor shaft 14 inclined pressure plate 22 is applied. On the pressure plate 22 may be present in the usual manner in the drawing, not shown, known piston of the driven by the drive device 10 piston pump. The pistons can be resiliently biased in the direction of the pressure plate and by the tumbling movement of the pressure plate 22, the piston can be moved parallel to the longitudinal axis 24 back and forth.

The planetary gear 16 has a central sun gear 26 which is rotatably held on the motor shaft 14 and meshes with a plurality of planetary gears, wherein two planetary gears 28, 29 are visible in Figure 1. The planet gears 28, 29 are on the one hand with the sun gear 26 and on the other hand with a coaxial with the sun gear 26 aligned, internally toothed ring gear 31 into engagement. The planetary gears 28, 29 are each held on a support pin 33 axially displaceable and rotatable. The support pins 33 form a part of a planet carrier 35 by being integrally connected to a central support part 36 of the planet carrier 35 that is aligned coaxially with the longitudinal axis 24. On the support member 36, the swash plate 18 is rotatably held, which is supported via a support bearing 38 on a bearing plate 40 in the axial direction. The bearing plate 40 is received by a receptacle 42 which is formed by a support ring 43. This becomes clear in particular from FIG. The bearing plate 40 dips in a form-fitting manner into a cylindrical holding section 45 of the receptacle 42. On the side facing away from the electric motor 12, the holding section 45 is followed by an insertion section 46 of the receptacle 42 on. The insertion section 46 widens conically in the direction away from the electric motor 12 and facilitates the insertion of the bearing plate 40 into the receptacle 42.

The holding section 45 comprises a cylindrical jacket 48 against which the bearing plate 40 rests with its outer side and which fixes the bearing plate 40 in the radial direction with respect to the longitudinal axis 24. In addition, the holding portion 45 has a bottom 49, on which the bearing plate 40 is supported in the axial direction.

The planetary gear 16 and the swash plate 18 are surrounded by a housing 51 having a cylindrical coaxially to the longitudinal axis 24 aligned first housing part 52 which is formed by the ring gear 31, and a second housing part 53 which surrounds the swash plate 18 in the circumferential direction and coaxial with first housing part 52 is aligned. Over a

Shoulder 54 is the first housing part 52 integrally in the second housing part 53 via. At the shoulder 54 of the receptacle 42 forming the support ring

43 on.

On the inside, the second housing part 53 has a plurality of parallel to the longitudinal axis 24 extending radially inwardly projecting guide ribs 56, which facilitate the insertion of the support ring 43 and the bearing plate 40 and the swash plate 18 in the second housing part 53.

The first housing part 42 is covered by the motor flange 13. This has the planetary gears 28, 29 facing an annular recess 58 into which a support ring 60 is positively inserted. The support ring 60 is the same as the planet gears 28, 29 made of a plastic material, preferably made of a POM material having no fiber reinforcement. With its end face 61 facing the planet wheels 28, 29, the support ring 60 forms a wear-resistant and friction-reducing abutment region 62 for the piano wheels 28, 29. The planetary gears, which are held movably in the axial direction on the support pins 23, can thus rest in a sliding manner on the contact region 62 of the support ring 60 during operation of the drive device 10, while maintaining their rotational movement. The made of the same plastic material as the planet gears 28, 29 support ring 60 has only a slight friction against the planetary gears 28, 29. Therefore, the planetary gears 28, 29 are subject to only slight wear during operation of the drive device 10. The drive device 10 is therefore characterized by a long service life.

The life of the drive device 10 is further improved by the provision of the receptacle 42, in which the bearing plate 40 dips in a form-fitting manner. The receptacle 42 forms an abutment for the bearing plate 40 and receives the forces acting in the axial and radial directions reliably.

FIGS. 3 and 4 show a second embodiment of a drive device according to the invention, which is designated overall by reference numeral 70.

The drive device 70 is designed substantially identical to the drive device 10 explained above. For identical components, therefore, the same reference numerals are used in FIGS. 3 and 4 as in the FIGS. 1 and 2 and to describe these components, reference is made to the above explanations to avoid repetition.

The drive device 70 differs from the drive device 10 in that the housing 51 and the motor flange 13 are integrally connected to each other. They form a one-piece plastic molding 72, which is made of a fiber-reinforced plastic material. In the shoulder-shaped transition region between the ring gear 31 forming the first housing part 52 of the plastic molded part 72 and the second housing part 53 surrounding the swash plate 18 in the circumferential direction, the plastic molded part 72 forms a receptacle 74 with a holding section 75 and an insertion section 76, into which the bearing plate 40 inserted or pressed. In contrast to the drive device 10 thus accounts for the drive device 70, a separate support ring which forms a receptacle for the bearing plate 40, but the receptacle 74 is formed in the one-piece plastic molding 72. The holding portion 75 of the receptacle 74 accommodates the bearing plate 40 in a form-fitting manner, wherein it comprises a cylindrical jacket 77 and an annular bottom 78 for the axial and radial support of the bearing plate 40. The insertion portion 76 adjoins the holding portion 75 on the side facing away from the electric motor 12 in the form of a conical extension.

The ring gear 31, this is particularly clear from Figure 4, has on the inside a plurality of teeth 81 which are directed radially inwardly and parallel to the longitudinal axis 24 extending inner edge 82 and radially extending front and rear end edges 83 and 84 include. The front end edge 83 faces the swash plate 18, and the rear end edge 84 is facing away from the swash plate 18. In the illustrated in Figures 3 and 4 Embodiment, the bottom 78 of the receptacle 74 is arranged axially in the amount of the front end edges 83. The bearing plate 40 thus sits on the floor 78 and on the front end edges 83, so it is supported in the axial direction on the one hand by the bottom 78 and the other by the front end edges 83. This makes it clear that the mechanical loading of the teeth 81 is reduced by the provision of the receptacle 74.

In order to enable oil equalization between the interior of the first housing part 52 and the interior of the second housing part 53, two channels 86 are formed diametrically opposite each other in the receptacle 74 of the drive device 70, which connect the two interiors. A channel 86 is shown in dashed lines in FIG. Via the channels 86, the bearing plate 40 can immediately flow, for example, starting from the area accommodating the swash plate 18 into the region of the planetary gear 16, so that sufficient lubrication of the planetary gear 16 is ensured via the channels 86. In the circumferential direction, the channels 86 extend only over a very limited angular range, for example over an angular range of less than 20 °, for example over an angular range of about 15 °. This ensures that the bearing plate 40 in spite of the molded into the receptacle 74 channels 86 in both radial

Direction as well as reliable support in the axial direction on the jacket 77 and the bottom 78 of the receptacle 74, which receives the bearing plate 40 accurately. It can be provided, for example, a clearance fit or a press fit between the bearing plate 40 and the receptacle 74. Correspondingly, in the case of the drive device 10 shown in FIGS. 1 and 2, between the support ring 43 and into the receptacle 42 the bearing ring 43 used bearing plate 40 come a clearance or interference fit are used.

As already mentioned, the plastic molding 72 is made of a fiber-reinforced plastic material. In contrast, the planet gears 28, 29 and the support ring 60 are made of a plastic material, preferably a POM material, without fiber reinforcement. The friction between the planet gears 28, 29 and the support ring 60 can thus be kept very low even in the drive device 70, so that the planetary gears 28, 29 are subject to only a very small wear. The drive device 70 is thus characterized by a long service life.

Claims

PATENT CLAIMS

1. Drive device for a high-pressure cleaner, with a motor, the motor shaft is coupled via a planetary gear with a swash plate, wherein the planetary gear rotatably connected to the motor shaft sun gear meshes with rotatably mounted on a planet carrier planetary gears with an internally toothed ring gear in engagement and with their planetary carrier facing away from the end face to a support member are slidably applied, characterized in that the support element (60) has a wear-resistant abutment region (62) for the planet wheels (28, 29).

2. Drive device according to claim 1, characterized in that the support element (60) on a motor flange (13) of the motor (12) is arranged net.

3. Drive device according to claim 2, characterized in that the support element (60) in a recess (58) of the motor flange (13) is immersed.

4. Drive device according to claim 2 or 3, characterized in that the support element (60) is positively connected to the motor flange (13).

5. Drive device according to one of the preceding claims, characterized in that the planet gears (28, 29) are made of a plastic material.

6. Drive device according to claim 5, characterized in that the planet gears (28, 29) are made of a POM material without fiber reinforcement.

7. Drive device according to one of the preceding claims, characterized in that the support element as concentric with the motor shaft

(14) aligned support ring (60) is formed.

8. Drive device according to one of the preceding claims, characterized in that the support element (60) is made of a plastic material.

9. Drive device according to claim 8, characterized in that the support element (60) is made of a POM material without fiber reinforcement.

10. Drive device according to one of the preceding claims, characterized in that the support element (60) and the planet wheels (28, 29) are made of the same plastic material having no fiber reinforcement.

11. Drive device according to one of the preceding claims, characterized in that the planetary gear (16) has a housing (51) on

has, which is frontally covered by a support member (60) supporting motor flange (13).

12. Drive device according to claim 11, characterized in that the housing (51) and the motor flange (13) are cohesively or integrally connected to each other.

13. Drive device according to claim 12, characterized in that the housing (51) and the motor flange (13) are designed as a one-piece plastic molded part (72).

14. Drive device with the features of the preamble of claim 1, in particular according to one of the preceding claims, wherein the swash plate is supported axially via a support bearing of a bearing plate, characterized in that the bearing plate (40) in a receptacle

(42; 74), which supports the bearing plate (40) in the axial and radial directions.

15. Drive device according to claim 14, characterized in that the receptacle (42, 74) receives the bearing plate (40) accurately.

16. Drive device according to claim 14 or 15, characterized in that the bearing plate (40) in the receptacle (42; 74) is pressed or inserted.

17. Drive device according to claim 14, 15 or 16, characterized in that the receptacle (42; 74) extends in the axial direction

the inserting portion (46; 76) for inserting the bearing plate (40) and a cylindrical holding portion (45; 75) for supporting the bearing plate (40).

18. Drive device according to one of claims 14 to 17, characterized in that the receptacle (42) as a support ring (43) is configured, which in a planetary gear (16) and / or the swash plate (18) surrounding housing (51) can be used is.

19. Drive device according to claim 18, characterized in that the support ring (43) bears against a shoulder (54) of the housing (51).

20. Drive device according to one of claims 14 to 17, characterized in that the receptacle (74) in a planetary gear (16) and / or the swash plate (18) surrounding the housing (72) is formed.

21. Drive device according to one of claims 14 to 20, characterized in that in the receptacle (74) at least one channel (86) is arranged, which arranged on both sides of the bearing plate (40)

Regions of the drive device (70) connects to each other.

22. Drive device according to one of claims 14 to 21, characterized in that the receptacle (42; 74) has a bearing plate (40) axially supporting bottom (49; 78) in the axial direction in front of or axially at the same height as that of the swashplate (18)

facing end edges (83) of the teeth (81) of the ring gear (31) is arranged.

23. Drive device according to one of claims 14 to 22, character- ized in that the drive device (70) is a planetary gear

(16) and / or the swash plate (18) receiving housing and at least one motor shaft supporting motor flange, wherein the housing and a motor flange are integrally connected to one another or in one piece.

24. Drive device according to claim 23, characterized in that the housing and the motor flange form a one-piece, fiber-reinforced plastic molding (72).